|  | 1.5 | Routing and the Different Classes of Routing Protocols
| 1.5.6 | Information that routers use to perform their basic functions
The success of dynamic routing depends on two basic router functions: Maintenance of a routing table Timely distribution of knowledge in the form of routing updates to other routers Dynamic routing relies on a routing protocol to share knowledge. A routing protocol defines the set of rules used by a router when it communicates with neighboring routers. For example, a routing protocol describes: How updates are sent What knowledge is contained in these updates When to send this knowledge How to locate recipients of the updates Exterior routing protocols are used to communicate between autonomous systems. Interior routing protocols are used within a single autonomous system.
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| IP Routing Protocols